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FastReport
Free Open Source Reporting tool for .NET6/.NET Core/.NET Framework that helps your application generate document-like reports
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I don't know if you mean something like FastReport, but I recently discovered it, and it seems pretty nice.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.